Problem: An automobile starter motor has an equivalent resistance of 0.0500 Ω and is supplied by a 12.0-V battery with a 0.0100-Ω internal resistance. If the battery connections are corroded and add 0.0900 Ω to the circuit. (Significant problems are caused by even small amounts of unwanted resistance in low-voltage, high-current applications.)(a) What is the current to the motor? (b) What voltage is applied to it? (c) What power is supplied to the motor? 

FREE Expert Solution

Let the added resistance due to the corrosion be r1 is added. The current in the motor will be calculated as:

i=εR+r+r1

Voltage in the motor is expressed as:

V=iR

Power is:

P=i2R

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Problem Details

An automobile starter motor has an equivalent resistance of 0.0500 Ω and is supplied by a 12.0-V battery with a 0.0100-Ω internal resistance. If the battery connections are corroded and add 0.0900 Ω to the circuit. (Significant problems are caused by even small amounts of unwanted resistance in low-voltage, high-current applications.)

(a) What is the current to the motor? 

(b) What voltage is applied to it? 

(c) What power is supplied to the motor? 

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